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Equity Cash distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 12, 2018
Nov. 14, 2017
Aug. 11, 2017
May 12, 2017
Jan. 24, 2017
Nov. 14, 2016
Aug. 12, 2016
May 13, 2016
Feb. 12, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Distribution Made to Limited Partner [Line Items]                        
Quarterly cash distribution (dollars per unit)   $ 0.715 $ 0.705 $ 0.69 $ 0.68 $ 0.655 $ 0.63 $ 0.61 $ 0.59      
Total Quarterly Distribution Per Limited Partner Unit, Annualized   $ 2.86 $ 2.82 $ 2.76 $ 2.72 $ 2.62 $ 2.52 $ 2.44 $ 2.36      
Total Cash Distribution, including general partner interest and IDRs (in thousands)   $ 22,270 $ 21,783 $ 21,024 $ 20,537 $ 19,302 $ 18,085 $ 17,095 $ 16,124      
General partner's IDRs                   $ 17,389 $ 11,160 $ 3,904
Total cash distributions                   $ 87,854 $ 75,019 $ 59,330
Cash distributions per limited partner unit                   $ 2.835 $ 2.575 $ 2.2400
Derivative Instruments and Hedging Activities Disclosure                  
Derivative Instruments

From time to time, we enter into forward fuel contracts to limit the exposure to price fluctuations for physical purchases of finished products in the normal course of business. We use derivatives to reduce the impact of market price volatility on our results of operations. Typically, we enter into forward fuel contracts with major financial institutions in which we fix the purchase price of finished grade fuel for a predetermined number of units with fulfillment terms of less than 90 days.

From time to time, we may also enter into interest rate hedging agreements to limit floating interest rate exposure under the Second Amended and Restated Credit Agreement. Our initial credit facility required us to maintain interest rate hedging arrangements on at least 50% of the amount funded on November 7, 2012 under the credit facility, which was required to be in place for at least a three-year period beginning no later than March 7, 2013. Accordingly, effective February 25, 2013, we entered into an interest rate hedge in the form of a LIBOR interest rate cap for a term of three years for a total notional amount of $45.0 million, thereby meeting the requirements in effect at that time. The interest rate hedge remained in place in accordance with its term through its maturity date in February 2016.

The following table presents the fair value of our derivative instruments, as of December 31, 2017 and 2016. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under our master netting arrangements, including any cash deficit or collateral on deposit with our counterparties. We have elected to offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements. As a result, the asset and liability amounts below may differ from the amounts presented in our accompanying consolidated balance sheets. During the years ended December 31, 2017 and 2016, we did not elect hedge accounting treatment for these derivative positions. As a result, all changes in fair value are marked to market in the accompanying consolidated statements of income and comprehensive income. See Note 16 for further information regarding the fair value of derivative instruments.

(in thousands)
 
 
December 31, 2017
 
December 31, 2016
Derivative Type
Balance Sheet Location
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives:
 
 
 
 
 
 
 
 
OTC commodity swaps (1) 
Other current assets
 
$
—

 
$
(1,087
)
 
$
9

 
$
(82
)
Total gross value of derivatives
 
—

 
(1,087
)
 
9

 
(82
)
Less: Counterparty netting and cash collateral (2)
 
 
—

 
(290
)
 
9

 
621

Total net fair value of derivatives
 
 
$
—

 
$
(797
)
 
$
—

 
$
(703
)
            
(1) 
As of December 31, 2017 and 2016, we had open derivative contracts representing 370,000 barrels and 93,000 barrels, respectively, of refined petroleum products.
(2) 
As of December 31, 2017 and 2016, we had cash collateral of $0.3 million and a cash deficit of $0.6 million, respectively, netted with the net derivative position of our counterparty.

Recognized gains (losses) associated with our derivatives for the years ended December 31, 2017 and 2016 were as follows (in thousands):
 
 
 
 
Year Ended December 31,
Derivative Type
Income Statement Location
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
Interest rate derivatives
Interest expense
 
$
—

 
$
—

 
$
(24
)
OTC commodity swaps
Cost of goods sold
 
(1,550
)
 
(2,122
)
 
441

 
 Total
 
$
(1,550
)
 
$
(2,122
)
 
$
417

    
General Partner                        
Distribution Made to Limited Partner [Line Items]                        
General partner's distributions                   $ 1,408 $ 1,277 $ 1,109
General partner's IDRs                   17,389 11,160 3,904
Total general partner's distributions                   18,797 12,437 5,013
Limited Partner                        
Distribution Made to Limited Partner [Line Items]                        
Limited partners' distribution                   69,057 62,582 54,317
Limited Partner | Common Units                        
Distribution Made to Limited Partner [Line Items]                        
Limited partners' distribution                   69,057 58,158 27,439
Limited Partner | Subordinated                        
Distribution Made to Limited Partner [Line Items]                        
Limited partners' distribution                   $ 0 $ 4,424 $ 26,878
Subsequent Event                        
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit, Annualized $ 2.90                      
Total Cash Distribution, including general partner interest and IDRs (in thousands) $ 22,777                      
Cash distributions per limited partner unit $ 0.725